Care home workers could be legally required to have coronavirus vaccines under proposals being looked at by the Government.
Health Secretary Matt Hancock confirmed that the idea was being looked at but stressed that no final decisions have been made.
A leaked paper submitted to the “Covid O” sub-committee of Cabinet suggested Mr Johnson and Mr Hancock had agreed to the proposal.
“The Prime Minister and the Secretary of State have discussed on several occasions the progress that is being made to vaccinate social care workers against Covid-19 and have agreed, in order to reach a position of much greater safety for care recipients, to put in place legislation to require vaccinations among the workforce,” The Telegraph reported.
Asked if it was being considered, Mr Hancock told BBC Breakfast: "Yes we are and it's important because those who look after those in care homes have a duty of care towards them and not every resident in an elderly care home can be vaccinated.
"Now the good news is more than three quarters of staff in elderly care home have been vaccinated so that is really good progress but still a long way further to go.
"It's already the case in the health service that vaccines are required, in certain circumstances doctors are required for instance to take the Hepatitis B vaccine, and we know that this vaccine is safe and effective.
"Some care homes have asked for us to change the law so that they can require their staff to be vaccinated because of this duty of care, so absolutely we are looking at that request but I would just stress that no final decisions have been taken."
The plans emerged amid concerns of low uptake of staff in care homes looking after those who are among the most vulnerable from contracting the disease.
But it would prove controversial, with the Prime Minister’s official spokesman previously accepting it would be “discriminatory” to force people to be vaccinated.
Care homes have been among the sectors hit hardest by pandemic.
An estimated one in 14 of the population of UK care homes has died after contracting the virus.
A Government spokesman: “The review into Covid status certification is considering a range of issues.
“No final decisions have been made.”
Only around a quarter of homes in London, and half in other parts of England, have reached the level of vaccination among staff and residents that is seen as a safe number by government scientists.
If the law change is voted through it means an estimated 1.5 million people who work in England's adult social care sector would need to be vaccinated.
The news comes two weeks after friends and relatives were allowed to make indoor visits with loved ones in care homes.
Under new guidance, residents can nominate a named visitor who can see them regularly - and they can even hold hands.
Indoor care home visits were banned during the latest lockdown in England and strict restrictions have been in place throughout the pandemic.
